Ōamishirasato in Fall
In fall (September, October and November), Ōamishirasato sees average daytime highs around 21°C and overnight lows near 17°C, with 506 mm of rain over about 39 wet days across the season. It is the 2nd-warmest season and the wettest season of the year.
Over the season highs ease from about 28°C in early September to 14°C by late November. The sky is clear or mostly clear about 31% of the time across fall, and the air most often feels dry.
Fall is Ōamishirasato's best season of the year to visit on our travel score. For the whole year in context, see Ōamishirasato's year-round climate.
- Avg daytime high
- 21°C
- 2nd-warmest season
- Avg overnight low
- 17°C
- Rainfall
- 506 mm
- 39 wet days
- Avg wind
- 12 km/h
- Travel score
- 5.6
- best season of the year
- Months
- Sep · Oct · Nov
Temperature in Ōamishirasato in Fall
Over the season highs ease from about 28°C in early September to 14°C by late November.
A typical fall day in Ōamishirasato reaches about 21°C and drops to 17°C overnight. The warmest of the three months is September, the coolest November.
How fall really feels in Ōamishirasato
Once humidity and wind are folded in, fall brings about 0 days that feel above 32°C and 0 that feel at or below 0°C.
fall sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.
Ōamishirasato weather by month
How the three fall months (September, October and November) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | 9° / 4° | 83 | 8.1 | 0.6 | 9.9 | 2.2 |
| Feb | 10° / 4° | 78 | 8.8 | 0.8 | 10.7 | 2.3 |
| Mar | 13° / 7° | 135 | 13.1 | 0.4 | 11.7 | 3.3 |
| Apr | 17° / 11° | 115 | 12.5 | 0 | 12.9 | 5.1 |
| May | 21° / 16° | 127 | 11.2 | 0 | 13.8 | 6.2 |
| Jun | 24° / 20° | 166 | 13.2 | 0 | 14.4 | 5.9 |
| Jul | 28° / 23° | 135 | 12.6 | 0 | 14.2 | 5.4 |
| Aug | 30° / 25° | 102 | 11.3 | 0 | 13.3 | 5.0 |
| Sep | 26° / 22° | 175 | 14.3 | 0 | 12.2 | 5.7 |
| Oct | 21° / 17° | 219 | 13.6 | 0 | 11.1 | 6.0 |
| Nov | 17° / 12° | 112 | 11 | 0 | 10.1 | 5.2 |
| Dec | 12° / 7° | 75 | 8.5 | 0 | 9.6 | 3.4 |
Cloud cover in Fall
The sky is clear or mostly clear about 31% of the time across fall.
Chance of precipitation in Fall
Ōamishirasato gets around 506 mm of rain over 39 wet days across fall. The line is the day-by-day chance of measurable precipitation.
Humidity in Fall
Most of fall feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Fall
Winds average 12 km/h across fall.
Sunrise & sunset in Fall
Daylight runs from about 12 h 48 min in early September to 9 h 48 min by late November. The lit band spans sunrise to sunset each day.
Solar energy in Fall
Average shortwave solar energy reaching the ground each day across fall, about 3.2 kWh/m².
Hazard calendar for Ōamishirasato
In fall, Ōamishirasato overlaps its pacific typhoon season. The full year is below, with each hazard's peak months called out.
Ōamishirasato sits in the Pacific typhoon belt; the season peaks July–October.
Is fall a good time to visit Ōamishirasato?
Our two travel scores rate fall for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
fall is a reasonable time to visit Ōamishirasato for sightseeing.
What to pack for Ōamishirasato in Fall
From fall's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In fall, Ōamishirasato sees daytime highs around 21°C and nights near 17°C. Pack rain gear. Worth having: light clothes and a warm layer. About 39 days see rain.
Sea temperature near Ōamishirasato in Fall
The nearest coast averages about 23°C across fall — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 28 km away) is warmest in August at about 25°C and coldest in February near 15°C.
It's comfortable for a long swim from Jun 5 to Nov 22 — about 5.6 months when the water holds above 20°C.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 16 | 15 | 15 | 16 | 19 | 21 | 23 | 25 | 25 | 23 | 21 | 18 |
| Comfort | Cool | Bracing | Cool | Cool | Cool | Refreshing | Refreshing | Warm | Warm | Refreshing | Refreshing | Cool |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 16 | Cool |
| Feb | 15 | Bracing |
| Mar | 15 | Cool |
| Apr | 16 | Cool |
| May | 19 | Cool |
| Jun | 21 | Refreshing |
| Jul | 23 | Refreshing |
| Aug | 25 | Warm |
| Sep | 25 | Warm |
| Oct | 23 | Refreshing |
| Nov | 21 | Refreshing |
| Dec | 18 | Cool |
UV index in Ōamishirasato in Fall
Clear-sky midday UV across fall averages around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Ōamishirasato peaks around August 12 at about 10 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near January 1 at about 2 (moderate).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 10 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 2 | 4 | 4 | 7 | 8 | 9 | 10 | 10 | 8 | 6 | 3 | 2 |
| Level | Moderate | Moderate | Moderate | High | Very high | Very high | Very high | Extreme | Very high | High | Moderate | Moderate |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 2 | Moderate |
| Feb | 4 | Moderate |
| Mar | 4 | Moderate |
| Apr | 7 | High |
| May | 8 | Very high |
| Jun | 9 | Very high |
| Jul | 10 | Very high |
| Aug | 10 | Extreme |
| Sep | 8 | Very high |
| Oct | 6 | High |
| Nov | 3 | Moderate |
| Dec | 2 | Moderate |
Air quality in Ōamishirasato in Fall
Average fine-particle pollution (PM2.5) through the year — so you can see where fall falls, not just the annual average.
Air quality in Ōamishirasato is worst in April — around 22 µg/m³ PM2.5 (moderate), about 1.9× the cleanest month (September, 11 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 14 | 17 | 21 | 22 | 21 | 16 | 12 | 11 | 11 | 14 | 14 | 13 |
| Level | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Good | Good | Good | Moderate | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 14 | Moderate |
| Feb | 17 | Moderate |
| Mar | 21 | Moderate |
| Apr | 22 | Moderate |
| May | 21 | Moderate |
| Jun | 16 | Moderate |
| Jul | 12 | Good |
| Aug | 11 | Good |
| Sep | 11 | Good |
| Oct | 14 | Moderate |
| Nov | 14 | Moderate |
| Dec | 13 | Moderate |
Where is Ōamishirasato?
Ōamishirasato sits at 35.5°N, 140.4°E, 7 m above sea level, in Japan. The nearest listed city is Ōami, 3.0 km away.
Topography around Ōamishirasato
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Ōamishirasato.
Within 3 km, the terrain around Ōamishirasato has only modest variations in elevation — a maximum elevation change of 20 m around an average of 7 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 186 m; within 80 km, significant variations in elevation — a maximum elevation change of 452 m.
The land around Ōamishirasato is covered by cropland (49%) and trees (28%) within 3 km, trees (35%), cropland (23%) and water (21%) within 16 km, and water (44%), trees (23%) and artificial surfaces (20%) within 80 km.
Japan travel facts
- Travel advisory
- Level 1
- Exercise Normal Precautions
- Power plugs
- Type A / B
- 100 V · 50 / 60 Hz
- Prices
- ≈ 65% of US
- price level, 2025
- GDP per capita
- $35,951
- 2025
- Happiness
- 6.1 / 10
- World Happiness, 2025
- Safe drinking water
- 99%
- of population, 2024
- Homicide rate
- 0.2
- per 100k, 2023
- Road deaths
- 3.6
- per 100k/yr, 2019
- Income group
- High
- World Bank
- English
- Very low
- EF EPI 446
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Ōamishirasato (35.5118°, 140.3526°, elevation 7 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google.